--- Begin Message ---
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Subject: |
23.1; regexp backslash-B matches word |
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Date: |
Fri, 22 Oct 2010 20:54:51 +0200 |
Please write in English if possible, because the Emacs maintainers
usually do not have translators to read other languages for them.
Your bug report will be posted to the address@hidden mailing list,
and to the gnu.emacs.bug news group.
Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:
According to emacs manual, \B matches the empty string, but it does not.
start emacs with emacs -q --no-site-file
move point over word in the splash screen.
M-:
(looking-at "\\B")
minibuffer says: T, should say nil
If Emacs crashed, and you have the Emacs process in the gdb debugger,
please include the output from the following gdb commands:
`bt full' and `xbacktrace'.
If you would like to further debug the crash, please read the file
/usr/share/emacs/23.1/etc/DEBUG for instructions.
In GNU Emacs 23.1.1 (i486-pc-linux-gnu, GTK+ Version 2.20.0)
of 2010-03-29 on rothera, modified by Debian
Windowing system distributor `The X.Org Foundation', version 11.0.10706000
configured using `configure '--build=i486-linux-gnu' '--host=i486-linux-gnu'
'--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib'
'--localstatedir=/var/lib' '--infodir=/usr/share/info'
'--mandir=/usr/share/man' '--with-pop=yes'
'--enable-locallisppath=/etc/emacs23:/etc/emacs:/usr/local/share/emacs/23.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/23.1/site-lisp:/usr/share/emacs/site-lisp:/usr/share/emacs/23.1/leim'
'--with-x=yes' '--with-x-toolkit=gtk' '--with-toolkit-scroll-bars'
'build_alias=i486-linux-gnu' 'host_alias=i486-linux-gnu' 'CFLAGS=-DDEBIAN -g
-O2' 'LDFLAGS=-g' 'CPPFLAGS=''
Important settings:
value of $LC_ALL: nil
value of $LC_COLLATE: nil
value of $LC_CTYPE: nil
value of $LC_MESSAGES: nil
value of $LC_MONETARY: nil
value of $LC_NUMERIC: nil
value of $LC_TIME: nil
value of $LANG: en_US.utf8
value of $XMODIFIERS: nil
locale-coding-system: utf-8-unix
default-enable-multibyte-characters: t
Major mode: Fundamental
Minor modes in effect:
tooltip-mode: t
tool-bar-mode: t
mouse-wheel-mode: t
menu-bar-mode: t
file-name-shadow-mode: t
global-font-lock-mode: t
blink-cursor-mode: t
global-auto-composition-mode: t
auto-encryption-mode: t
auto-compression-mode: t
line-number-mode: t
transient-mark-mode: t
Recent input:
<right> M-: <up> ( l o o k i n g - a t SPC " " <left>
\ \ B <right> ) <return> <left> M-: <up> <return> <right>
<help-echo> M-x r e p o <tab> r t - e <tab> <retur
n>
Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
goto-history-element: Beginning of history; no preceding item
t
nil
Making completion list...
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--- End Message ---
--- Begin Message ---
|
Subject: |
Re: bug#7267: 23.1; regexp backslash-B matches word |
|
Date: |
Sat, 23 Oct 2010 11:00:44 +0200 |
sorry, I misunderstood. But I now understand it means it always returns t
except for the noted cases, as any string contains the empty string.
-------- Original-Nachricht --------
> Datum: Fri, 22 Oct 2010 22:49:27 -0400
> Von: Glenn Morris <address@hidden>
> An: "Thibault Kruse" <address@hidden>
> CC: address@hidden
> Betreff: Re: bug#7267: 23.1; regexp backslash-B matches word
> "Thibault Kruse" wrote:
>
> > According to emacs manual, \B matches the empty string, but it does not.
>
> The elisp manual says:
>
> Backslash Constructs in Regular Expressions
> [...]
>
> `\B'
> matches the empty string, but _not_ at the beginning or end of a
> word, nor at the beginning or end of the buffer (or string).
>
> > start emacs with emacs -q --no-site-file
> > move point over word in the splash screen.
> > M-:
> > (looking-at "\\B")
> > minibuffer says: T, should say nil
>
> Why do you think it should return nil?
>
> This construct matches the empty string inside words.
> It only returns nil at word boundaries. Try
>
> (looking-at "\\B")
>
> with point at the start, middle, and end of a word.
> It returns nil, t, nil, as it should.
>
> The empty string is _empty_, ie length zero, not whitespace or
> anything like that.
>
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--- End Message ---